Results 21 to 30 of about 5,813 (191)

Determining optimal policies for sugarcane harvesting in Thailand using bi-objective and quasi-Newton optimization methods

Advances in Difference Equations, 2019
In Thailand, the harvesting season for sugarcane usually begins in November and ends the following May. At the beginning of each harvesting season, the Royal Thai government sets the price of two types of sugarcane, namely fresh and fired, based on ...
Wisanlaya Pornprakun, Surattana Sungnul, Chanakarn Kiataramkul, Elvin J. Moore   +3 more
doaj   +1 more source

Speeding-up the Fitting of the Model Defining the Ribs-bounded Contour

Applied Computer Systems, 2017
The method for analysing transversal plane images from computer tomography scans is considered in the paper. This method allows not only approximating ribs-bounded contour but also evaluating patient rotation around the vertical axis during a scan.
Bilinskas Mykolas J., Dzemyda Gintautas, Sabaliauskas Martynas   +2 more
doaj   +1 more source

Mathematical Programming Method Based on Chaos Anti-Control for the Solution of Forward Displacement of Parallel Robot Mechanisms

International Journal of Advanced Robotic Systems, 2013
The pose of the moving platform in parallel robots is possible thanks to the strong coupling, but it consequently is very difficult to obtain its forward displacement.
Youxin Luo, Qiyuan Liu, Xiaoyi Che
doaj   +1 more source

ROBUST QUASI-NEWTON EQUATIONS IN QUASI-NEWTON METHOD FOR SOLVING UNCONSTRAINED OPTIMIZATION PROBLEMS

Barekeng
Quasi-Newton methods are among the most widely used and effective general-purpose algorithms for unconstrained optimization. These methods traditionally rely on the quasi-Newton equation, which serves as the foundation for updating approximations of the
Basim A. Hassan, Manal I. Mohammed
doaj   +1 more source

Modifications for Quasi-Newton Method and Its Spectral Algorithm for Solving Unconstrained Optimization Problems

مجلة بغداد للعلوم
In this paper, two modifications for spectral quasi-Newton algorithm of type BFGS are imposed. In the first algorithm, named SQNEI, a certain spectral parameter is used in such a step for BFGS algorithm differs from other presented algorithms.
Evar Lutfalla Sadraddin, Ivan Subhi Latif   +1 more
doaj   +1 more source

Performance Analysis and Implementation of Hybrid Conjugate Gradient Method in Electromagnetic Tomography [PDF]

Mathematical Sciences and Informatics Journal
Electromagnetic tomography (EMT) is a type of electrical tomography based on electromagnetic induction. Reconstructing images with EMT involves solving inverse problems, which are often poorly defined due to limited prior information about ...
Michelle Ubong Sari, Norhaslinda Zullpakkal, Nurfatihah Anizan, Dzul Dzaihan Dzul Dzailani, Nur Syarafina Mohamed   +4 more
doaj   +1 more source

Convergence and Stability Improvement of Quasi-Newton Methods by Full-Rank Update of the Jacobian Approximates

AppliedMath
A system of simultaneous multi-variable nonlinear equations can be solved by Newton’s method with local q-quadratic convergence if the Jacobian is analytically available.
Peter Berzi
doaj   +1 more source

Thermally Robust Room‐Temperature Interlayer Excitons in a Hybrid van der Waals Heterostructure

Advanced Functional Materials, EarlyView.
We report an optically active interlayer exciton in a hybrid van der Waals (PEA)2PbBr4/MoS2 heterostructure that remains thermally stable up to 400 K. The emission exhibits polarization anisotropy consistent with an out‐of‐plane optical transition‐dipole component and shows lifetime extension indicative of electron–hole separation.
Seoyeon Ko, Hyeon Jun Jeong, Soungmin Bae, Jieun Jo, Chan Kwon, Hayoung Ko, Dong Hyeon Kim, Hyunjung Shin, Mun Seok Jeong, Seokhyun Yoon   +9 more
wiley   +1 more source

Multiobjective Codesign Optimization of a Planar Pneumatic Artificial Muscle‐Based Snake‐Like Robot for Enhanced Agility and Energy Efficiency

Advanced Robotics Research, EarlyView.
A codesign multiobjective optimization framework was developed to enhance the morphology and controller of a snake‐like robot driven by artificial muscles. It improved planar locomotion, agility, and power efficiency. The approach optimized link geometry and controller gains, revealing that shorter muscles near joints and longer linkages maximize ...
Ayla Valles, Mahdi Haghshenas‐Jaryani
wiley   +1 more source

From Folding Mechanics to Robotic Function: A Unified Modeling Framework for Compliant Origami

Advanced Science, EarlyView.
A geometry‐consistent DDG framework captures compliant origami deformation from rigid‐like folding to soft panel bending. By tuning crease and panel stiffness, bistable snap‐through responses transform into smooth monostable deformation, enabling programmable stability and robot‐scale locomotion.
Bohan Zhang, Bo Wang, Huajiang Ouyang, Zhigang Wu, Haohao Bi, Jiawei Xu, Mingchao Liu, Weicheng Huang   +7 more
wiley   +1 more source